If lactic acid builds up in thigh muscles, it causes muscle tiredness and pain. This condition is called:
Correct answer: A. Muscle Fatigue
- A. Muscle Fatigue
- B. Tetany
- C. Cramps
- D. Oxygen debt in muscles
Explanation
Muscle Fatigue: This option is the correct answer. The condition described, where lactic acid builds up in thigh muscles, causing tiredness and pain, is known as muscle fatigue. Muscle fatigue occurs when muscles are unable to contract efficiently and sustain their performance due to various factors such as the depletion of energy stores, accumulation of metabolic byproducts like lactic acid, or inadequate oxygen supply.
This question appeared on the UHS MDCAT 2015 paper, which you can sit online with every answer explained.
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Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
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